*{
    padding: 0;
    margin: 0;
}

//声明变量
/* 声明变量 */
$fontSize : 18px;
$lineHeight : 1.5;
$colors : red yellow green blue;
$map : (me : red,you : yellow,he : blue);

@mixin size($width : 100%,$height : 100%){
    width : $width;
    height: $height;
}
@mixin position($position:absolute,$left:0,$top:0){
    position: $position;
    left: $left;
    top: $top;
}
@function fnColor($key){
    @return map-get($map,$key);
}